Ok, I have a Dyno frame here, details are:

Flat gusset behind the seatmast.
Round brake bridge.(tubular)
Coaster brake tab.
Single welded-on cable guide on the toptube
a few inches from the headtube.
Ser# G5K04882 under the BB.

Is this an '85-6-7ish D30, a compe, procompe?
Any ideas?

It's the exact frame I've been looking for to rebuild my fave old stylin' bike. But since I picked the original up 2nd or 3rd hand I'm not sure what I had.

"G5" = july of 1985 manufacture, in japan. all the Dyno frames were the same at that point, only the different parts made them a different model.

cool, it was sold as an '88 and I was fairly positive it was earler than that. Thanks Coaster!